The Audi A4 40 TDI (2.0D) 204hp (B9 - 2019 ->) produces 204bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 450Nm, a gain of 16bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.